Malicious PDF — malware analysis report

Static analysis result for SHA-256 6256c33ca23dfe99…

MALICIOUS

PDF

284.6 KB Created: 2021-07-09 01:56:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 88a54242f27b80b8dd6af13e1ae7ab9a SHA-1: 8c2a804fafa95553eafb00894d301238985cff09 SHA-256: 6256c33ca23dfe99f53c580a6591c779b4609546682b6042cb8a23a7bda55183
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains a link farm pointing to compromised WordPress upload storage, suggesting an attempt to distribute further malicious content. No scripts were extracted, but the presence of multiple external URIs, many hosted on compromised sites, strongly suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9759

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://rocb-ap.org/file_media/file_image/file/xosafoga.pdf In PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/2t380n6qnhji0hrhrtreied6n5/buwelazaruguvonosa.pdfIn PDF document text
    • http://kapalishakti.com/ckfinder/userfiles/files/zigazenagoj.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/fmefmfhhgmfk2vlaj3rod3h6eo/98277383345.pdfIn PDF document text
    • http://armanetti.com/images/3723278206.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608657e25161c---voxawosudululun.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080781931c69---8927660214.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/16087d922d4428---81527504793.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160895e278c6e6---20181563672.pdfIn PDF document text
    • http://haozuowenwang.com/imagefiles/file/54037018406.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/16090d4fc5104d---geribujiwob.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/d4da0d62649abd4b237261cb7561ee66/fikajokisewez.pdfIn PDF document text
    • https://aimhc.com/userfiles/file/38077322069.pdfIn PDF document text
    • http://anonelectronics.com/admin/fckeditor/editor/filemanager/connectors/php/upload_jpg/file/202107082155233059.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/9631ef4b2e52d7e4d8f6b0e22104115b/64559130928.pdfIn PDF document text
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1608566fd8f346---gikedewipowabob.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/1608f6d987074f---17021300918.pdfIn PDF document text
    • http://www.dfdtrading.sk/ckfinder/userfiles/files/sapedamarodego.pdfIn PDF document text
    • http://workprohealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8806d6330---56650919778.pdfIn PDF document text
    • https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/ca22e60be529a1726d54e53e591e7c6b/mopukeduvuwezezufatikifi.pdfIn PDF document text
    • http://tunglamgarden.com/images/fck/file/bapevafolitisepogovuvo.pdfIn PDF document text
    • http://venturahigh1967.com/clients/40640/File/4757921911.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adce317c441---81688447966.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/3e41f6a132d300ba3f6096fbde2d4f2a/81453071602.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=vehicle+dynamics+theory+and+application+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000401d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x401D4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000419e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x419E6 17836 bytes
SHA-256: 1a195e23d4ca72bf4a8625fc3547b35353cc7fb352bab0df3e72ce7f90255707
font_02_sfnt_off00044850.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x44850 10968 bytes
SHA-256: 28fbfa42543238d8a2a5bd825795fe8b78d5214e6e72d4148cddf572d934165d